The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/in_pcb.h

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    1 /*-
    2  * Copyright (c) 1982, 1986, 1990, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)in_pcb.h    8.1 (Berkeley) 6/10/93
   30  * $FreeBSD: releng/6.0/sys/netinet/in_pcb.h 150828 2005-10-02 15:45:47Z andre $
   31  */
   32 
   33 #ifndef _NETINET_IN_PCB_H_
   34 #define _NETINET_IN_PCB_H_
   35 
   36 #include <sys/queue.h>
   37 #include <sys/_lock.h>
   38 #include <sys/_mutex.h>
   39 
   40 #include <net/route.h>
   41 
   42 #define in6pcb          inpcb   /* for KAME src sync over BSD*'s */
   43 #define in6p_sp         inp_sp  /* for KAME src sync over BSD*'s */
   44 struct inpcbpolicy;
   45 
   46 /*
   47  * Common structure pcb for internet protocol implementation.
   48  * Here are stored pointers to local and foreign host table
   49  * entries, local and foreign socket numbers, and pointers
   50  * up (to a socket structure) and down (to a protocol-specific)
   51  * control block.
   52  */
   53 LIST_HEAD(inpcbhead, inpcb);
   54 LIST_HEAD(inpcbporthead, inpcbport);
   55 typedef u_quad_t        inp_gen_t;
   56 
   57 /*
   58  * PCB with AF_INET6 null bind'ed laddr can receive AF_INET input packet.
   59  * So, AF_INET6 null laddr is also used as AF_INET null laddr,
   60  * by utilize following structure. (At last, same as INRIA)
   61  */
   62 struct in_addr_4in6 {
   63         u_int32_t       ia46_pad32[3];
   64         struct  in_addr ia46_addr4;
   65 };
   66 
   67 /*
   68  * NOTE: ipv6 addrs should be 64-bit aligned, per RFC 2553.
   69  * in_conninfo has some extra padding to accomplish this.
   70  */
   71 struct in_endpoints {
   72         u_int16_t       ie_fport;               /* foreign port */
   73         u_int16_t       ie_lport;               /* local port */
   74         /* protocol dependent part, local and foreign addr */
   75         union {
   76                 /* foreign host table entry */
   77                 struct  in_addr_4in6 ie46_foreign;
   78                 struct  in6_addr ie6_foreign;
   79         } ie_dependfaddr;
   80         union {
   81                 /* local host table entry */
   82                 struct  in_addr_4in6 ie46_local;
   83                 struct  in6_addr ie6_local;
   84         } ie_dependladdr;
   85 #define ie_faddr        ie_dependfaddr.ie46_foreign.ia46_addr4
   86 #define ie_laddr        ie_dependladdr.ie46_local.ia46_addr4
   87 #define ie6_faddr       ie_dependfaddr.ie6_foreign
   88 #define ie6_laddr       ie_dependladdr.ie6_local
   89 };
   90 
   91 /*
   92  * XXX
   93  * the defines for inc_* are hacks and should be changed to direct references
   94  */
   95 struct in_conninfo {
   96         u_int8_t        inc_flags;
   97         u_int8_t        inc_len;
   98         u_int16_t       inc_pad;        /* XXX alignment for in_endpoints */
   99         /* protocol dependent part */
  100         struct  in_endpoints inc_ie;
  101 };
  102 #define inc_isipv6      inc_flags       /* temp compatability */
  103 #define inc_fport       inc_ie.ie_fport
  104 #define inc_lport       inc_ie.ie_lport
  105 #define inc_faddr       inc_ie.ie_faddr
  106 #define inc_laddr       inc_ie.ie_laddr
  107 #define inc6_faddr      inc_ie.ie6_faddr
  108 #define inc6_laddr      inc_ie.ie6_laddr
  109 
  110 struct  icmp6_filter;
  111 
  112 struct inpcb {
  113         LIST_ENTRY(inpcb) inp_hash; /* hash list */
  114         LIST_ENTRY(inpcb) inp_list; /* list for all PCBs of this proto */
  115         u_int32_t       inp_flow;
  116 
  117         /* local and foreign ports, local and foreign addr */
  118         struct  in_conninfo inp_inc;
  119 
  120         caddr_t inp_ppcb;               /* pointer to per-protocol pcb */
  121         struct  inpcbinfo *inp_pcbinfo; /* PCB list info */
  122         struct  socket *inp_socket;     /* back pointer to socket */
  123                                         /* list for this PCB's local port */
  124         struct  label *inp_label;       /* MAC label */
  125         int     inp_flags;              /* generic IP/datagram flags */
  126 
  127         struct  inpcbpolicy *inp_sp; /* for IPSEC */
  128         u_char  inp_vflag;              /* IP version flag (v4/v6) */
  129 #define INP_IPV4        0x1
  130 #define INP_IPV6        0x2
  131 #define INP_IPV6PROTO   0x4             /* opened under IPv6 protocol */
  132 #define INP_TIMEWAIT    0x8             /* .. probably doesn't go here */
  133 #define INP_ONESBCAST   0x10            /* send all-ones broadcast */
  134         u_char  inp_ip_ttl;             /* time to live proto */
  135         u_char  inp_ip_p;               /* protocol proto */
  136         u_char  inp_ip_minttl;          /* minimum TTL or drop */
  137 
  138         /* protocol dependent part; options */
  139         struct {
  140                 u_char  inp4_ip_tos;            /* type of service proto */
  141                 struct  mbuf *inp4_options;     /* IP options */
  142                 struct  ip_moptions *inp4_moptions; /* IP multicast options */
  143         } inp_depend4;
  144 #define inp_fport       inp_inc.inc_fport
  145 #define inp_lport       inp_inc.inc_lport
  146 #define inp_faddr       inp_inc.inc_faddr
  147 #define inp_laddr       inp_inc.inc_laddr
  148 #define inp_ip_tos      inp_depend4.inp4_ip_tos
  149 #define inp_options     inp_depend4.inp4_options
  150 #define inp_moptions    inp_depend4.inp4_moptions
  151         struct {
  152                 /* IP options */
  153                 struct  mbuf *inp6_options;
  154                 /* IP6 options for outgoing packets */
  155                 struct  ip6_pktopts *inp6_outputopts;
  156                 /* IP multicast options */
  157                 struct  ip6_moptions *inp6_moptions;
  158                 /* ICMPv6 code type filter */
  159                 struct  icmp6_filter *inp6_icmp6filt;
  160                 /* IPV6_CHECKSUM setsockopt */
  161                 int     inp6_cksum;
  162                 u_short inp6_ifindex;
  163                 short   inp6_hops;
  164         } inp_depend6;
  165         LIST_ENTRY(inpcb) inp_portlist;
  166         struct  inpcbport *inp_phd;     /* head of this list */
  167         inp_gen_t       inp_gencnt;     /* generation count of this instance */
  168         struct mtx      inp_mtx;
  169 
  170 #define in6p_faddr      inp_inc.inc6_faddr
  171 #define in6p_laddr      inp_inc.inc6_laddr
  172 #define in6p_ip6_hlim   inp_depend6.inp6_hlim
  173 #define in6p_hops       inp_depend6.inp6_hops   /* default hop limit */
  174 #define in6p_ip6_nxt    inp_ip_p
  175 #define in6p_flowinfo   inp_flow
  176 #define in6p_vflag      inp_vflag
  177 #define in6p_options    inp_depend6.inp6_options
  178 #define in6p_outputopts inp_depend6.inp6_outputopts
  179 #define in6p_moptions   inp_depend6.inp6_moptions
  180 #define in6p_icmp6filt  inp_depend6.inp6_icmp6filt
  181 #define in6p_cksum      inp_depend6.inp6_cksum
  182 #define inp6_ifindex    inp_depend6.inp6_ifindex
  183 #define in6p_flags      inp_flags  /* for KAME src sync over BSD*'s */
  184 #define in6p_socket     inp_socket  /* for KAME src sync over BSD*'s */
  185 #define in6p_lport      inp_lport  /* for KAME src sync over BSD*'s */
  186 #define in6p_fport      inp_fport  /* for KAME src sync over BSD*'s */
  187 #define in6p_ppcb       inp_ppcb  /* for KAME src sync over BSD*'s */
  188 };
  189 /*
  190  * The range of the generation count, as used in this implementation,
  191  * is 9e19.  We would have to create 300 billion connections per
  192  * second for this number to roll over in a year.  This seems sufficiently
  193  * unlikely that we simply don't concern ourselves with that possibility.
  194  */
  195 
  196 /*
  197  * Interface exported to userland by various protocols which use
  198  * inpcbs.  Hack alert -- only define if struct xsocket is in scope.
  199  */
  200 #ifdef _SYS_SOCKETVAR_H_
  201 struct  xinpcb {
  202         size_t  xi_len;         /* length of this structure */
  203         struct  inpcb xi_inp;
  204         struct  xsocket xi_socket;
  205         u_quad_t        xi_alignment_hack;
  206 };
  207 
  208 struct  xinpgen {
  209         size_t  xig_len;        /* length of this structure */
  210         u_int   xig_count;      /* number of PCBs at this time */
  211         inp_gen_t xig_gen;      /* generation count at this time */
  212         so_gen_t xig_sogen;     /* socket generation count at this time */
  213 };
  214 #endif /* _SYS_SOCKETVAR_H_ */
  215 
  216 struct inpcbport {
  217         LIST_ENTRY(inpcbport) phd_hash;
  218         struct inpcbhead phd_pcblist;
  219         u_short phd_port;
  220 };
  221 
  222 struct inpcbinfo {              /* XXX documentation, prefixes */
  223         struct  inpcbhead *hashbase;
  224         u_long  hashmask;
  225         struct  inpcbporthead *porthashbase;
  226         u_long  porthashmask;
  227         struct  inpcbhead *listhead;
  228         u_short lastport;
  229         u_short lastlow;
  230         u_short lasthi;
  231         struct  uma_zone *ipi_zone; /* zone to allocate pcbs from */
  232         u_int   ipi_count;      /* number of pcbs in this list */
  233         u_quad_t ipi_gencnt;    /* current generation count */
  234         struct  mtx ipi_mtx;
  235 };
  236 
  237 /*
  238  * NB: We cannot enable assertions when IPv6 is configured as
  239  *     this code is shared by both IPv4 and IPv6 and IPv6 is
  240  *     not properly locked.
  241  */
  242 #define INP_LOCK_INIT(inp, d, t) \
  243         mtx_init(&(inp)->inp_mtx, (d), (t), MTX_DEF | MTX_RECURSE | MTX_DUPOK)
  244 #define INP_LOCK_DESTROY(inp)   mtx_destroy(&(inp)->inp_mtx)
  245 #define INP_LOCK(inp)           mtx_lock(&(inp)->inp_mtx)
  246 #define INP_UNLOCK(inp)         mtx_unlock(&(inp)->inp_mtx)
  247 #define INP_LOCK_ASSERT(inp)    do {                                    \
  248         mtx_assert(&(inp)->inp_mtx, MA_OWNED);                          \
  249         NET_ASSERT_GIANT();                                             \
  250 } while (0)
  251 #define INP_UNLOCK_ASSERT(inp)  mtx_assert(&(inp)->inp_mtx, MA_NOTOWNED)
  252 
  253 #define INP_INFO_LOCK_INIT(ipi, d) \
  254         mtx_init(&(ipi)->ipi_mtx, (d), NULL, MTX_DEF | MTX_RECURSE)
  255 #define INP_INFO_LOCK_DESTROY(ipi)  mtx_destroy(&(ipi)->ipi_mtx)
  256 #define INP_INFO_RLOCK(ipi)     mtx_lock(&(ipi)->ipi_mtx)
  257 #define INP_INFO_WLOCK(ipi)     mtx_lock(&(ipi)->ipi_mtx)
  258 #define INP_INFO_RUNLOCK(ipi)   mtx_unlock(&(ipi)->ipi_mtx)
  259 #define INP_INFO_WUNLOCK(ipi)   mtx_unlock(&(ipi)->ipi_mtx)
  260 #define INP_INFO_RLOCK_ASSERT(ipi)      do {                            \
  261         mtx_assert(&(ipi)->ipi_mtx, MA_OWNED);                          \
  262         NET_ASSERT_GIANT();                                             \
  263 } while (0)
  264 #define INP_INFO_WLOCK_ASSERT(ipi)      do {                            \
  265         mtx_assert(&(ipi)->ipi_mtx, MA_OWNED);                          \
  266         NET_ASSERT_GIANT();                                             \
  267 } while (0)
  268 
  269 #define INP_PCBHASH(faddr, lport, fport, mask) \
  270         (((faddr) ^ ((faddr) >> 16) ^ ntohs((lport) ^ (fport))) & (mask))
  271 #define INP_PCBPORTHASH(lport, mask) \
  272         (ntohs((lport)) & (mask))
  273 
  274 /* flags in inp_flags: */
  275 #define INP_RECVOPTS            0x01    /* receive incoming IP options */
  276 #define INP_RECVRETOPTS         0x02    /* receive IP options for reply */
  277 #define INP_RECVDSTADDR         0x04    /* receive IP dst address */
  278 #define INP_HDRINCL             0x08    /* user supplies entire IP header */
  279 #define INP_HIGHPORT            0x10    /* user wants "high" port binding */
  280 #define INP_LOWPORT             0x20    /* user wants "low" port binding */
  281 #define INP_ANONPORT            0x40    /* port chosen for user */
  282 #define INP_RECVIF              0x80    /* receive incoming interface */
  283 #define INP_MTUDISC             0x100   /* user can do MTU discovery */
  284 #define INP_FAITH               0x200   /* accept FAITH'ed connections */
  285 #define INP_RECVTTL             0x400   /* receive incoming IP TTL */
  286 #define INP_DONTFRAG            0x800   /* don't fragment packet */
  287 
  288 #define IN6P_IPV6_V6ONLY        0x008000 /* restrict AF_INET6 socket for v6 */
  289 
  290 #define IN6P_PKTINFO            0x010000 /* receive IP6 dst and I/F */
  291 #define IN6P_HOPLIMIT           0x020000 /* receive hoplimit */
  292 #define IN6P_HOPOPTS            0x040000 /* receive hop-by-hop options */
  293 #define IN6P_DSTOPTS            0x080000 /* receive dst options after rthdr */
  294 #define IN6P_RTHDR              0x100000 /* receive routing header */
  295 #define IN6P_RTHDRDSTOPTS       0x200000 /* receive dstoptions before rthdr */
  296 #define IN6P_TCLASS             0x400000 /* receive traffic class value */
  297 #define IN6P_AUTOFLOWLABEL      0x800000 /* attach flowlabel automatically */
  298 #define IN6P_RFC2292            0x40000000 /* used RFC2292 API on the socket */
  299 #define IN6P_MTU                0x80000000 /* receive path MTU */
  300 
  301 #define INP_CONTROLOPTS         (INP_RECVOPTS|INP_RECVRETOPTS|INP_RECVDSTADDR|\
  302                                  INP_RECVIF|INP_RECVTTL|\
  303                                  IN6P_PKTINFO|IN6P_HOPLIMIT|IN6P_HOPOPTS|\
  304                                  IN6P_DSTOPTS|IN6P_RTHDR|IN6P_RTHDRDSTOPTS|\
  305                                  IN6P_TCLASS|IN6P_AUTOFLOWLABEL|IN6P_RFC2292|\
  306                                  IN6P_MTU)
  307 #define INP_UNMAPPABLEOPTS      (IN6P_HOPOPTS|IN6P_DSTOPTS|IN6P_RTHDR|\
  308                                  IN6P_TCLASS|IN6P_AUTOFLOWLABEL)
  309 
  310  /* for KAME src sync over BSD*'s */
  311 #define IN6P_HIGHPORT           INP_HIGHPORT
  312 #define IN6P_LOWPORT            INP_LOWPORT
  313 #define IN6P_ANONPORT           INP_ANONPORT
  314 #define IN6P_RECVIF             INP_RECVIF
  315 #define IN6P_MTUDISC            INP_MTUDISC
  316 #define IN6P_FAITH              INP_FAITH
  317 #define IN6P_CONTROLOPTS INP_CONTROLOPTS
  318         /*
  319          * socket AF version is {newer than,or include}
  320          * actual datagram AF version
  321          */
  322 
  323 #define INPLOOKUP_WILDCARD      1
  324 #define sotoinpcb(so)   ((struct inpcb *)(so)->so_pcb)
  325 #define sotoin6pcb(so)  sotoinpcb(so) /* for KAME src sync over BSD*'s */
  326 
  327 #define INP_SOCKAF(so) so->so_proto->pr_domain->dom_family
  328 
  329 #define INP_CHECK_SOCKAF(so, af)        (INP_SOCKAF(so) == af)
  330 
  331 #ifdef _KERNEL
  332 extern int      ipport_lowfirstauto;
  333 extern int      ipport_lowlastauto;
  334 extern int      ipport_firstauto;
  335 extern int      ipport_lastauto;
  336 extern int      ipport_hifirstauto;
  337 extern int      ipport_hilastauto;
  338 extern struct callout ipport_tick_callout;
  339 
  340 void    in_pcbpurgeif0(struct inpcbinfo *, struct ifnet *);
  341 int     in_pcballoc(struct socket *, struct inpcbinfo *, const char *);
  342 int     in_pcbbind(struct inpcb *, struct sockaddr *, struct ucred *);
  343 int     in_pcbbind_setup(struct inpcb *, struct sockaddr *, in_addr_t *,
  344             u_short *, struct ucred *);
  345 int     in_pcbconnect(struct inpcb *, struct sockaddr *, struct ucred *);
  346 int     in_pcbconnect_setup(struct inpcb *, struct sockaddr *, in_addr_t *,
  347             u_short *, in_addr_t *, u_short *, struct inpcb **,
  348             struct ucred *);
  349 void    in_pcbdetach(struct inpcb *);
  350 void    in_pcbdisconnect(struct inpcb *);
  351 int     in_pcbinshash(struct inpcb *);
  352 struct inpcb *
  353         in_pcblookup_local(struct inpcbinfo *,
  354             struct in_addr, u_int, int);
  355 struct inpcb *
  356         in_pcblookup_hash(struct inpcbinfo *, struct in_addr, u_int,
  357             struct in_addr, u_int, int, struct ifnet *);
  358 void    in_pcbnotifyall(struct inpcbinfo *pcbinfo, struct in_addr,
  359             int, struct inpcb *(*)(struct inpcb *, int));
  360 void    in_pcbrehash(struct inpcb *);
  361 void    in_pcbsetsolabel(struct socket *so);
  362 int     in_setpeeraddr(struct socket *so, struct sockaddr **nam, struct inpcbinfo *pcbinfo);
  363 int     in_setsockaddr(struct socket *so, struct sockaddr **nam, struct inpcbinfo *pcbinfo);
  364 struct sockaddr *
  365         in_sockaddr(in_port_t port, struct in_addr *addr);
  366 void    in_pcbsosetlabel(struct socket *so);
  367 void    in_pcbremlists(struct inpcb *inp);
  368 void    ipport_tick(void *xtp);
  369 #endif /* _KERNEL */
  370 
  371 #endif /* !_NETINET_IN_PCB_H_ */

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